I read this as: I know ads are likely if not inevitable but I can’t say that while I’m trying to gain users and inspire trust but I’ll start to float even in this non-denial the justification for the thing I’m ultimately going to do.
You’d have to go company-wide to sync schedules and norms. Not just opt in. Many would not like a 20% pay cut. The best talent would disproportionately leave.
Also, theoretically Meta is getting rid of their worst performers, so their cuts and declines in productivity would not be proportional, especially as the cuts inspire fear to motivate productivity from the remaining employees.